Originally Posted by
megan
People who smoke may have an inaccurately high pulse ox reading. Smoking causes carbon monoxide to build up in your blood. A pulse ox can’t tell the difference between this other type of gas and oxygen may be one reason, that carbon monoxide could very well be coming from your exhaust system. Cold extremities and dark nail polish can also cause false low readings.
And skin colour ..... Lots of reasons why a pulse oximter can be a fair bit out. Fractional Vs Functional etc etc etc